JP5410120B2 - Peep window - Google Patents

Description

  The present invention relates to a viewing window provided on a front wall of an electrical equipment box such as a switchboard, a distribution board, a control panel, and an instrument panel.

  There are several forms of this type of viewing window mounting structure. One is a form in which a glass plate and a packing are disposed between an outer frame and an inner frame, and the glass plate is sandwiched and fixed to the window opening by both inner and outer frames fastened by bolts (Patent Document 1). Each of the outer frame and the inner frame is formed by bending an aluminum strip into a square frame and welding the ends of the strip. In this case, since the bolt assembled to the outer frame is located inside the inner edge of the window opening, it is not necessary to form a bolt insertion hole in the peripheral wall of the window opening. In addition, the endless outer frame and inner frame are fastened with a number of bolts, preventing the glass plate from falling even if the packing disappears due to a fire, etc., and spreading the fire inside the electrical equipment box Can be prevented.

  The outer frame is composed of a main frame made of a rubber molded product and a core frame made of a metal plate to be assembled later in the main frame, and a glass plate is formed in a circumferential groove provided on the main frame. There is also a viewing window that is fitted (Patent Document 2). Then, after inserting the bolt fixed to the core frame body into the bolt through hole of the inner frame and fastening with a nut, the viewing window can be clamped and fixed to the window opening by the outer frame and the inner frame.

  The other is to arrange the packing, glass plate and window frame in order on the outer surface of the window opening, and pass the bolts inserted and fixed to the window frame through the bolt insertion holes provided along the peripheral wall of the window opening. In this configuration, a nut is screwed into the bolt on the side, and the viewing window is pulled and fixed to the peripheral wall of the window opening (Patent Document 3). In this case, the window frame is formed of a plastic molded product, and the window structure can be simplified to the extent that the inner frame and the packing on the inner frame side can be omitted as compared with the viewing window of Patent Document 1. A similar viewing window is also disclosed in Patent Document 4, in which a glass plate is fastened with a pair of upper and lower drop prevention fittings so that the glass plate can be prevented from dropping when the window frame and packing are lost. ing.

Japanese Patent No. 2761710 (paragraph number 0016, FIG. 2) Japanese Examined Patent Publication No. 63-42067 (first page, second column, lines 21 to 26, FIG. 2) The full text of Japanese Utility Model Publication No. 52-56745 (page 3, lines 8 to 18, Fig. 3) JP 2001-193363 A (paragraph number 0010, FIG. 1)

  Since the viewing window of Patent Document 1 is formed by bending an aluminum strip into a square frame to form an outer frame and an inner frame, the structural strength of both frames compared to a viewing window in which the inner frame and the outer frame are formed by punching steel plates. It is also excellent in appearance. However, since the number of component parts of the viewing window is large and processing of the inner frame and the outer frame takes a lot of work, the overall cost increases. Further, as much as the number of component parts is large, it takes time to assemble the viewing window at the construction site.

  In that regard, in the viewing window of Patent Document 2, since the main frame is formed of a rubber molded product, the main frame itself exerts the function of packing, and the used portion of the packing is defined between the window opening and the inner frame. It can be limited only to the interval, and the structure of the observation window can be simplified correspondingly, and the overall cost can be reduced. However, since the core frame body is formed in an endless ring shape, it is difficult to fit the core frame body in the circumferential loading groove provided in the main frame body, and much labor is required for assembling the core frame body and the glass plate. Inevitable.

  In the viewing window of Patent Document 3, the window frame is formed of a plastic molded product, and the bolt head is inserted and fixed therein, so that the structure of the viewing window can be further simplified and the overall cost can be reduced. However, if the window frame or packing disappears due to a fire, the glass plate cannot be supported and the glass plate cannot be prevented from falling. Moreover, since the viewing window of patent document 4 fastens a glass plate with a fall prevention metal fitting, even when a window frame and packing lose | disappear, it can prevent a glass plate falling to some extent. However, since only the upper and lower ends of the glass plate are supported by the pair of upper and lower drop prevention fittings, it is impossible to prevent the glass plate from falling when the window frame and packing disappear and the bolt tilts.

  The object of the present invention is to simplify the structure of the sight glass and reduce the overall cost.In addition, it is possible to quickly and easily assemble the sight glass at the construction site, and to eliminate the window frame. An object of the present invention is to provide a viewing window capable of reliably preventing the accompanying glass plate from falling and reliably preventing the spread of fire inside the electrical equipment box. An object of the present invention is to provide a common viewing window at a lower cost by sharing parts to be used even when the viewing window has a different size.

The viewing window according to the present invention is attached to an electrical equipment box in which a window opening 3 is formed on the wall surface of the electrical equipment box and a group of bolt insertion holes 4 are formed along the periphery of the viewing opening. The viewing window that covers the outer surface of the window opening 3 includes a glass plate 5 having an outer shape larger than the outer shape of the window opening 3 and a window frame 6 that holds the glass plate 5. Window frame 6 becomes a window frame body 10 made of a rubber molded article, the reinforcing frame 11 is embedded in the wall the wall of the window frame body 10, a bolt 12 which is integrated in the reinforcing frame 11, these reinforcement frame 11 and a bolt 12 are insert-fixed to the window frame main body 10. The window frame main body 10 is formed with a fastening seat surface 20 that comes into contact with the peripheral wall of the window opening 3 including the opening edge of the bolt insertion hole 4. A mounting groove 15 having an inner clamping wall 16 and an outer clamping wall 17 for clamping the peripheral edge of the glass plate 5 inward and outward is recessed in a circular shape on the inner peripheral surface of the frame of the window main body 10 from the fastening seating surface 20. It is formed. The peripheral edge of the glass plate 5 fitted in the mounting groove 15 is held by the inner clamping wall 16 and the outer clamping wall 17 and the groove bottom wall of the mounting groove 15. The reinforcing frame 11 is formed by integrating four corner frames 25 and a linear side frame 26 connecting the corner frames 25 into an endless frame shape. The bolt 12 is fixed to each of the corner frame 25 and the side frame 26, and in a state where the window frame body 10 is assembled to the peripheral wall of the window opening 3, the protruding end side of the screw shaft 27 of the bolt 12 is connected to the bolt insertion hole 4. Projecting to the inner surface side of the peripheral wall of the window opening 3. In a state where the nut 13 is screwed into the bolt 12 inserted into the bolt insertion hole 4 and the window frame 6 and the glass plate 5 are fastened to the peripheral wall of the window opening 3, the peripheral edges of the glass plate 5 are the inner and outer holding walls 16 and 17. through it characterized that you have been held fixed in and out at the peripheral wall of the window opening 3 and the reinforcing frame 11.

The side frame 26 is formed of a strip-shaped strip material integrally provided with a protrusion 26a and a seat wall 26b. The bolt 12 is integrally provided with a screw shaft 27 and a seat portion 28 that is formed to protrude from one end of the screw shaft 27. The screw shaft 27 is press-fitted and inserted into the burring portion 29 provided on the protrusion 26a of the corner frame 25 and the side frame 26, whereby the opening edge 29a of the burring portion 29 is bitten into the screw thread, and the bolt 12 is The frame 25 and the side frame 26 are integrated so as not to be relatively rotatable, and the seat 28 is received by the burring portion 29.

The glass plate 5 and window frame 6 is in the viewing window is formed in a rectangular shape that four corners are rounded, the reinforcing frame 11, and four corners frame 25, a linear connecting were what each corner frame 25 constituted by the side part frame 26, it is formed in an endless frame shape by welding in a state of overlapping the adjacent ends to each other for each frame 25, 26. Therefore, at least the corner frame 25 is shared in the observation windows having different vertical and horizontal dimensions.

  A first lip 21 for preventing rainwater from entering is provided around the outer peripheral edge of the fastening seating surface 20 of the window frame main body 10 in contact with the peripheral wall of the window opening 3. A second lip 18 that prevents rainwater from entering is provided in a circular shape along the inner surface of the outer holding wall 17 that contacts the outer peripheral surface of the glass plate 5.

  In the present invention, a viewing window is constituted by the glass plate 5 having an outer shape larger than the outer shape of the window opening 3 and the window frame 6 for holding and fixing the glass plate 5, and the glass plate 5 is fitted in the mounting groove 15 in advance. Since the window frame 6 in the state is fastened and fixed to the peripheral wall of the window opening 3 to form the viewing window, the structure of the viewing window can be remarkably simplified and the overall cost can be reduced as compared with the viewing window having the conventional structure. In addition, the inspection window can be quickly and easily assembled to the peripheral wall of the window opening 3 by reducing the time required for assembly at the construction site as much as the structure can be simplified.

  Furthermore, in a state where the window frame 6 is fastened to the peripheral wall of the window opening 3, the peripheral edge of the glass plate 5 is formed by the peripheral wall of the window opening 3 and the reinforcing frame 11 inserted into the window frame main body 10. -Since it clamps and fixes via 17, even if it is the glass plate 5 with a heavy weight, the glass plate 5 can be fixed accurately and firmly. Moreover, even if the window frame main body 10 disappears due to a fire or the like, the glass plate 5 can be supported by the reinforcing frame 11 and a large number of bolts 12 to prevent the glass plate 5 from falling, thereby spreading the fire inside the electric equipment box 1. It can be surely prevented.

  When the reinforcing frame 11 is composed of a plurality of partial frame bodies 25 and 26, a plurality of types of partial frame bodies 25 and 26 having different lengths and shapes are prepared, and by changing the combination form variously, the outer size can be reduced. Different reinforcing frames 11 can be easily configured. Therefore, it is possible to reduce the manufacturing cost when manufacturing various types of viewing windows having different sizes one by one. In addition, when the partial frames 25 and 26 are shared, the viewing window can be manufactured at a lower cost. In addition, since the bolts 12 are fixed to the partial frame bodies 25 and 26, even when the window frame main body 10 disappears, the partial frame bodies 25 and 26 are reliably prevented from falling, and the glass plate 5 Can be reliably prevented.

  In a rectangular viewing window with rounded corners, the reinforcing frame 11 is endlessly composed of four corner frames 25 including a quadrangular arc-shaped frame surface and a linear side frame 26 connecting the corner frames 25 to each other. When configured in a frame shape, at least the corner frame 25 is shared by all the observation windows having different vertical and horizontal dimensions, and the cost of the reinforcement frame 11 can be reduced by that much, and the observation window can be manufactured at a lower cost. Also, by preparing several types of linear side frames 26, the side frames 26 can be shared in the reinforcing frames 11 having different vertical and horizontal dimensions, so that the cost of the observation window can be reduced accordingly. Furthermore, since the glass plate 5 is supported by the endless reinforcing frame 11 and a large number of bolts 12, even if the window frame main body 10 disappears due to a fire or the like, the glass plate 5 is reliably prevented from falling, and the electric device The fire spread to the inside of the box 1 can be reliably prevented.

  According to the window frame body 10 in which the first lip 21 is provided on the outer peripheral edge of the fastening seat surface 20 and the second lip 18 is provided on the inner surface of the outer clamping wall 17, the space between the fastening seat surface 20 and the peripheral wall of the window opening 3 is provided. The first lip 21 can prevent the rainwater from entering, and the second lip 18 can prevent the rainwater from entering between the outer holding wall 17 and the glass plate 5. That is, it is not necessary to add a dedicated packing, and a necessary portion can be sealed only by the window frame main body 10, so that the structure can be simplified and the cost can be reduced even though the observation window has a high-level sealing function. Since the lips 18 and 21 can be integrally formed when the window frame main body 10 is molded, it is possible to save the trouble of integrating the lips 18 and 21 with the window frame main body 10.

  The bolt 12 is constituted by the screw shaft 27 and the seat portion 28 formed to extend to one end of the screw shaft 27, and the screw shaft 27 is press-fitted into the burring portions 29 provided in the partial frame bodies 25 and 26, When the bolt 12 is integrated with the partial frame bodies 25 and 26, for example, the bolt 12 is lower than the partial frame bodies 25 and 26 compared to the case where the bolt 12 is welded to the partial frame bodies 25 and 26. Can be fixed at cost.

  If the corner frame 25 is formed of a quarter-arc plate, and the side frame 26 is formed of a cross-section hat-shaped strip integrally including a protrusion 26a and a seat wall 26b, the structural strength of the side frame 26 is increased. Thus, the strength of the reinforcing frame 11 is improved accordingly, and even the glass plate 5 having a larger weight can be supported in a stable state. Further, the corner frame 25 and the side frame 26 are firmly integrated by welding the end portion of the corner frame 25 on the outer surface of the end portion 26a of the side frame 26 so as to connect them. It is possible to reliably prevent the portion from shifting or separating during molding of the window frame main body 10, and to improve the yield when manufacturing the window frame 6.

It is the sectional view on the AA line in FIG. It is a perspective view of the electric equipment box to which the observation window is applied, and a front view of the inspection window. It is a disassembled perspective view of the state which isolate | separated the observation window from the wall opening. It is sectional drawing equivalent to FIG. 1 which shows the state just before mounting | wearing a viewing window with a wall opening. It is a front view of a reinforcement frame. It is a disassembled front view which shows the combination structure of a reinforcement frame.

(Example) FIG. 1 thru | or 6 shows the Example of the observation window which concerns on this invention. In FIG. 2, reference numeral 1 denotes an electric equipment box constituting a distribution board or a distribution board, and a viewing window of the present invention is mounted on one of a pair of doors 2 provided on the front face thereof. As shown in FIG. 3, a rectangular window opening 3 with rounded corners is formed on the wall surface of the door 2 to which the viewing window is mounted, and a group of bolt insertion holes 4 are formed along the periphery. .

  The viewing window is composed of a glass plate 5 and a window frame 6 that holds the glass plate 5. The glass plate 5 is made of transparent tempered glass or transparent netted glass, and is formed in a horizontally long rectangular shape that is slightly larger than the outer shape of the window opening 3, and its four corners are rounded in the same manner as the window opening 3. is there. The window frame 6 includes a window frame main body 10 made of a rubber molded product made of ethylene-propylene rubber, and a reinforcing frame 11 and bolts 12 that are insert-fixed to the window frame main body 10.

  As shown in FIG. 4, the window frame main body 10 is made of an endless frame having a horizontally long rectangular shape that is slightly larger than the outer shape of the glass plate 5, and the glass plate 5 is fitted along the inner peripheral edge of the frame. A mounting groove 15 is formed as a recess. The mounting groove 15 having a U-shaped cross section is formed between an inner clamping wall 16 and an outer clamping wall 17 that clamp the periphery of the glass plate 5 inward and outward, and the inner surface of the outer clamping wall 17 facing the mounting groove 15. A second lip 18 for preventing intrusion of rainwater is provided in a circular shape.

  As shown by an imaginary line in FIG. 1, the second lip 18 is a lip having a triangular cross section provided on the opening edge side of the mounting groove 15. The mounting groove 15 has a groove width of 6.3 mm and a groove depth of 6.5 mm. The thickness of the glass plate 5 fitted and fitted in the mounting groove 15 is 6.3 mm. However, even if the glass plate 5 has a thickness of 6.0 mm or 6.8 mm, the glass plate 5 is fitted into the mounting groove 15 without any problem. be able to.

  The window frame main body 10 is formed with a fastening seat surface 20 that comes into contact with the peripheral wall of the window opening 3, and a first lip 21 that prevents rainwater from entering is provided around the outer peripheral edge. is there. As shown in FIG. 4, the first lip 21 is a lip having a triangular cross section provided at the outer edge of the fastening seat surface 20. A chamfered inclined surface 22 is formed on the outer peripheral edge of the outer surface of the window frame facing the fastening seat surface 20, and a step portion 23 is formed on the inner peripheral edge of the outer surface of the window frame.

  As shown in FIG. 5, the reinforcing frame 11 includes four corner frames (partial frame bodies) 25 including a quadrangular arc-shaped frame surface, and four linear side frames arranged adjacent to each corner frame 25. (Partial frame) 26. The corner frame 25 is formed of a plate material having a semicircular arc shape, and the side frame 26 is formed of a cross-sectional hat-shaped strip material integrally provided with a protrusion 26a and a seat wall 26b. One bolt 12 is fixed to the central part of the corner frame 25 and the side frame 26 on the short side, and two bolts 12 are fixed to the left and right sides of the side frame 26 on the long side. . The bolt 12 is integrally provided with a screw shaft 27 and a seat portion 28 that is formed to protrude from one end of the screw shaft 27. As shown in FIG. 1, the screw shaft 27 of the bolt 12 is press-fitted through the burring portion 29 provided in each frame 25, 26, so that the opening edge 29 a of the burring portion 29 is bitten into the screw thread, The bolt 12 can be integrated with the frame bodies 25 and 26 so as not to rotate relative to each other.

  As shown in FIG. 5, the corner frame 25 and the side frame 26 are integrated into an endless frame shape by welding in a state where adjacent ends of each frame are overlapped. In detail, it integrates by welding the edge part of the corner frame 25 on the outer surface of the edge part of the protrusion part 26a of the side part frame 26, and welding. A weld point is indicated by reference numeral 30. The reinforcing frame 11 in this state is loaded into the molding die together with the rubber material and clamped, and then heated while being pressed to fix the reinforcing frame 11 and the bolt 12 to the window frame main body 10 to be inserted, The window frame 6 can be formed. The protruding end side of the screw shaft 27 of the bolt 12 in this state protrudes from the fastening seat surface 20 of the window frame body 10. Further, the reinforcing frame 11 is embedded in the wall of the window frame main body 10, and the inner peripheral edge thereof reaches the middle part of the mounting groove 15 in the groove depth direction. The meaning will be described later.

  The glass plate 5 is fitted and mounted in the mounting groove 15 of the obtained window frame 6. Specifically, one side of the glass plate 5 is inserted into the mounting groove 15, and the peripheral edge of the glass plate 5 is gradually fitted into the mounting groove 15 while turning up the inner clamping wall 16 with a spatula-shaped jig. In the state where the glass plate 5 is mounted on the window frame main body 10, as shown in FIG. 1, the second lip 18 is compressed and deformed so as to adhere to the outer surface of the glass plate 5, so that rainwater enters the mounting groove 15. It can be surely prevented from entering.

  As described above, the viewing window is shipped after being packed together with a required number of nuts 13 in a state where the glass plate 5 is integrated with the window frame 6. Therefore, at the construction site, as shown in FIG. 3, the window frame 6 taken out from the cardboard box can be applied to the peripheral wall of the window opening 3, and the bolt 12 can be inserted into the bolt insertion hole 4 to be held in a temporarily assembled state. Furthermore, by screwing a washer and a nut 13 into the bolt 12 from the inner surface side of the door 2, the glass plate 5 and the window frame 6 can be fixed to the outer surface of the door 2, with less effort compared to a conventional viewing window, and independently. A viewing window can be assembled only by the workers.

  In a state where the window frame 6 is mounted on the door 2, the peripheral edge of the glass plate 5 is pinched and fixed inside and outside by the peripheral wall of the window opening 3 and the reinforcing frame 11 via the inner and outer holding walls 16 and 17. At this time, the overlap dimension L between the peripheral edge of the glass plate 5 and the reinforcing frame 11 is 4 mm. Therefore, even if the glass plate 5 has a large size and weight, it is not necessary to provide a square pressing frame on the inner surface side of the window opening 3, and the glass plate 5 can be securely clamped and fixed only by the window frame 6. As described above, according to the viewing window of the present invention, the structure of the viewing window can be simplified and the overall cost can be reduced as compared with the conventional viewing window in which the glass plate is sandwiched and fixed between the inner and outer frames. it can. Moreover, it is possible to quickly and easily assemble the viewing window at the construction site with less effort. Moreover, even if the window frame main body 10 disappears due to a fire or the like, the glass plate 5 can be supported by the endless reinforcing frame 11 and a large number of bolts 12, so that the glass plate 5 can be reliably prevented from falling, and the electric equipment The fire spread to the inside of the box 1 can be reliably prevented.

  There are several types of viewing windows depending on the difference in vertical and horizontal dimensions. For example, names such as 200 × 200, 200 × 300, 300 × 300, 300 × 400, 300 × 500, and 400 × 500 are provided. The name of the viewing window described in the embodiment is 200 × 300. As shown in FIG. 6, for example, when forming a viewing window having a name of 200 × 200, the four corner frames 25 and the above-described implementation are used. The reinforcing frame 11 can be configured by sharing the four short side frames 26 in the example. When a 300 × 400 viewing window is formed, the four corner frames 25 and the two long side frames 26 in the above-described embodiment are shared, and the side having a longer dimension is shared. By preparing the part frame, the reinforcing frame 11 can be configured. In this way, by preparing three to four types of side frame 26, the reinforcing frame 11 corresponding to the previously named viewing window can be formed.

In the viewing window of the present invention, the window frame main body 10 is formed of a rubber molded product, so that its outer shape can be freely set as necessary. Therefore, the outer shape of the window frame main body 10 does not need to be a square, and may be a circle, an ellipse, a rhombus, or the like . Part partial frame need not be formed by welding the endless frame shape, but may prevent the positional deviation of the adjacent end each other by engagement connection of each part frame. For example, an engagement hole that opens at an adjacent end is provided at an adjacent end of one partial frame body, and an engagement protrusion that fits into the engagement hole is provided at an adjacent end of the other partial frame body. The adjacent ends can be engaged with each other.

The bolt 12 is formed only at the screw shaft 27 can be fixed by welding the one end portion frame. In the case where the seat portion 28 is formed in a polygonal shape, the seat portion 28 may be fitted into the polygonal burring portion 29 and fixed by insertion.

  Other than the above embodiment, the corner portion of the glass plate 5 does not need to be rounded, and may be cut off obliquely in a chamfered shape. The window frame main body 10 can be formed of natural rubber other than ethylene-propylene rubber, synthetic rubber, or an elastomer resin that can exhibit rubber elasticity. In the embodiment, it is assumed that the window frame body 10 is molded by the compression molding method, but it is not necessary, and the window frame body 10 may be molded by other molding methods such as an injection molding method or a transfer molding method. Good. The first and second lips 21 and 18 can be constituted by one or a plurality of lips having an arbitrary cross-sectional shape. The bolt 12 can be welded or caulked to the partial frame bodies 25 and 26. The viewing window of the present invention can also be applied when a transparent plastic plate is used instead of the glass plate 5.

3 Window opening 4 Bolt insertion hole 5 Glass plate 6 Window frame 10 Window frame body 11 Reinforcing frame 12 Bolt 15 Mounting groove 16 Inner clamping wall 17 Outer clamping wall 18 Second lip 20 Fastening seat surface 21 First lip 25 Corner frame (part Frame)
26 Side frame (partial frame)

Claims (4)

A rectangular frame-shaped window opening (3) is formed on the wall surface of the electric equipment box, and a group of bolt insertion holes (4) for mounting the observation window along the periphery thereof are formed,
A viewing window covering the outer surface of the window opening (3) is composed of a glass plate (5) having an outer shape larger than the inner shape of the window opening (3) and a window frame (6) holding the glass plate (5). And
The window frame (6) is integrated with the window frame main body (10) made of a rubber molded product , the reinforcing frame (11) embedded in the wall of the window frame main body (10), and the reinforcing frame (11). it from a bolt (12) has, these reinforcing frame (11) and the bolt (12) but are inserted fixed to the window frame body (10),
The window frame body (10) is formed with a fastening seat surface (20) that contacts the peripheral wall of the window opening (3) including the opening edge of the bolt insertion hole (4).
An inner clamping wall (16) and an outer clamping wall (17) for clamping the peripheral edge of the glass plate (5) inward and outward on the outer peripheral side of the fastening seating surface (20) on the inner peripheral surface of the frame of the window frame main body (10) A mounting groove (15) with a recess is formed in a circular shape,
The peripheral edge of the glass plate (5) fitted in the mounting groove (15) is held by the inner clamping wall (16) and the outer clamping wall (17) and the groove bottom wall of the mounting groove (15). And
The reinforcing frame (11) is formed by integrating four corner frames (25) and a linear side frame (26) connecting the corner frames (25) into an endless frame shape,
The bolt (12) is fixed to each of the corner frame (25) and the side frame (26), and in the state where the window frame body (10) is assembled to the peripheral wall of the window opening (3), the bolt (12 ) Of the screw shaft (27) protrudes to the inner surface side of the peripheral wall of the window opening (3) through the bolt insertion hole (4),
By screwing the nut (13) on the bolt (12) inserted through the bolt insertion hole (4), in engagement condition on the peripheral wall of the window frame (6) and the glass plate (5) a window opening (3), the glass plate (5) peripherally inner and outer peripheral wall and the reinforcing frame (11) and de peephole characterized that you have been held fixed in and out of the sandwiching wall (16, 17) a window opening (3) through the. The side frame (26) is formed of a cross-section hat-shaped strip that integrally includes a protrusion (26a) and a seat wall (26b).
The bolt (12) is integrally provided with a screw shaft (27) and a seat portion (28) formed to protrude from one end of the screw shaft (27).
The screw shaft (27) is press-fitted into the burring portion (29) provided on the protrusion (26a) of the corner frame (25) and the side frame (26), thereby opening the opening edge (29a) of the burring portion (29). The bolt (12) is integrated with the corner frame (25) and the side frame (26) so as not to rotate relative to each other, and the seat (28) is received by the burring portion (29). Tei Ru claim 1 sight glass according. The glass plate (5) and the window frame (6) are formed in a quadrangular shape with rounded corners,
The reinforcing frame (11) is composed of four corner frames (25) and a linear side frame (26) connecting the corner frames (25 ), and adjacent to each frame (25, 26). It is formed into an endless frame by welding in a state where the ends are overlapped ,
The sight glass according to claim 2, wherein at least the corner frame (25) is shared among the sight windows having different vertical and horizontal dimensions. A first lip (21) for preventing intrusion of rainwater is provided in a circular shape along the outer peripheral edge of the fastening seating surface (20) of the window frame body (10) contacting the peripheral wall of the window opening (3). And
The second lip (18) for preventing intrusion of rainwater is provided around the inner surface of the outer holding wall (17) in contact with the outer peripheral edge of the glass plate (5). Peep window .

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